Cretornis is a pterosaur genus from the late Cretaceous period (Turonian stage) of what is now the Jizera Formation in the Czech Republic, dating to about 92 million years ago.

The fossils were discovered in 1880 by workers at a sandstone quarry in Zářecká Lhota near the town of Choceň, who were getting gravel to repair a local road.

In 1881, Antonín Frič identified it as a prehistoric toothed bird the size of a recent swan and named it as the type species Cretornis Hlaváči.

It contains a complete humerus (upper arm bone), an ulna, radius, wrist and two phalanges of the wing finger.

More detailed comparisons of the wing bones led Averianov to conclude in 2015 that they belonged to a non-azhdarchid azhdarchoid, probably a member of the group Neoazhdarchia with which it has many features in common.

[7][8] It is probably more advanced than the Thalassodromidae, and shares with Montanazhdarcho the trait that the distal part of the ulna has a joint surface that is placed more proximal than the tubercle.